If you are not set up to recieve automatic updates from microsoft you should change your settings to download these automatically and keep these up to date. To do this go to the start button, go to control panel, and then to security center. Click on automatic updates and follow the prompts.To get all of the latest updates go to the start button, go to all programs, point to and left click on windows update. This will start the process of updating your system. After some updates your system will need to be restarted,some do not require a restart. You have to repeat the windows update process a few times in order to recieve all of the latest updates.

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Start - All programmes - windows update (top left hand corner). If you choose the "custom" option for downloads, you should be able to see/check all the downloads and updates. These should also include SP3.

To download xp service pack 2 you can go to the microsoft download center and from their you can download the software or you can simply click on this link this will directly download the windows XP service pack 2 :

When you install the Administration Tools Pack on a computer that is
running Windows XP Professional x64 Edition, the Active Directory Users
and Computers MMC snap-in file (Dsa.msc) is installed in the
%windir%\Syswow64 folder. Additionally, the computer's file system maps
the Active Directory Users and Computers MMC snap-in to the following
path:
DriveLetter:\%windir%\Syswow64\Dsa.mscHowever,
the Active Directory Domains and Trust MMC snap-in incorrectly
specifies the path of the Active Directory Users and Computers MMC
snap-in as follows:
DriveLetter:\%windir%\System32\Dsa.mscWhen
the computer's file system tries to locate the Dsa.msc file from within
the Active Directory Domains and Trust MMC snap-in, Mmc.exe is run.
Mmc.exe is run because the Dsa.msc file is associated with Mmc.exe.
When Mmc.exe is run, it uses the following path to locate Dsa.msc:
DriveLetter:\%windir%\System32\Dsa.msc DomainPathAfter
the Mmc.exe command is run, the Active Directory Domains and Trust MMC
snap-in tries to locate the Dsa.msc file. Because the Dsa.msc file does
not exist in the %windir%\System32 folder, the error message that is
mentioned in the "Symptoms" section is generated.

To resolve this problem, manually copy the Dsa.msc file from the %windir%\Syswow64 folder to the %windir%\System32 folder.

Your hardware manufacturer provides technical support and assistance
for Microsoft Windows x64 editions. Your hardware manufacturer provides
support because a Windows x64 edition was included with your hardware.
Your hardware manufacturer might have customized the Windows x64
edition installation with unique components. Unique components might
include specific device drivers or might include optional settings to
maximize the performance of the hardware. Microsoft will provide
reasonable-effort assistance if you need technical help with your
Windows x64 edition. However, you might have to contact your
manufacturer directly. Your manufacturer is best qualified to support
the software that your manufacturer installed on the hardware.

For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:

Hi sachin. Copy the model number of your sound card from the motherboard's CD and search for the drivers in the corresponding vendor's site. You will definitely find the drivers on the site. Else , just post the model of the sound device, i will you the link to the driver download.